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Optics Letters

Optics Letters

| RAPID, SHORT PUBLICATIONS ON THE LATEST IN OPTICAL DISCOVERIES

  • Editor: Alan E. Willner
  • Vol. 35, Iss. 21 — Nov. 1, 2010
  • pp: 3607–3609

Optical-feedback cavity-enhanced absorption spectroscopy with a quantum cascade laser

G. Maisons, P. Gorrotxategi Carbajo, M. Carras, and D. Romanini  »View Author Affiliations


Optics Letters, Vol. 35, Issue 21, pp. 3607-3609 (2010)
http://dx.doi.org/10.1364/OL.35.003607


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Abstract

Optical-feedback cavity-enhanced absorption spectroscopy is demonstrated in the mid-IR by using a quantum cascade laser (emitting at 4.46 μm ). The laser linewidth reduction and frequency locking by selective optical feedback from the resonant cavity field turns out to be particularly advantageous in this spectral range: It allows strong cavity transmission, which compensates for low light sensitivity, especially when using room-temperature detectors. We obtain a noise equivalent absorption coefficient of 3 × 10 9 /cm for 1 s averaging of spectra composed by 100 independent points. At 4.46 μm , this yields a detection limit of 35 parts in 10 12 by volume for N 2 O at 50 mbar , corresponding to 4 × 10 7 molecules / cm 3 , or still to 1 fmol in the sample volume.

© 2010 Optical Society of America

OCIS Codes
(120.6200) Instrumentation, measurement, and metrology : Spectrometers and spectroscopic instrumentation
(140.4780) Lasers and laser optics : Optical resonators
(280.3420) Remote sensing and sensors : Laser sensors
(140.5965) Lasers and laser optics : Semiconductor lasers, quantum cascade

ToC Category:
Lasers and Laser Optics

History
Original Manuscript: July 22, 2010
Revised Manuscript: September 2, 2010
Manuscript Accepted: September 12, 2010
Published: October 21, 2010

Citation
G. Maisons, P. Gorrotxategi Carbajo, M. Carras, and D. Romanini, "Optical-feedback cavity-enhanced absorption spectroscopy with a quantum cascade laser," Opt. Lett. 35, 3607-3609 (2010)
http://www.opticsinfobase.org/ol/abstract.cfm?URI=ol-35-21-3607

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